class_docstr: Internal class for defining compatibility and debugging flags
code: def _set(cls, dname, value):
      if dname in cls._fixed_names:
          warnings.warn(
              f"{cls.__name__}.{dname} {cls._type_desc} is {str(getattr(cls, dname)).upper()}"
              f" and cannot be overridden",
              stacklevel=3,
          )
          return
      if dname in cls._all_names:
          setattr(cls, dname, value)
      else:
          raise ValueError(f"no such {cls._type_desc} {dname!r}")
  
imports: import inspect
  import warnings
  import types
  import collections
  import itertools
  from functools import lru_cache, wraps
  from typing import Callable, List, Union, Iterable, TypeVar, cast
label_desc: Use image node_id 1 for calling the __config_flags obj's underlying member method code with example usage: obj._set(cls, dname, value) without return types